20965945

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{59}}^1\times {\mathrm{71}}^1$

素因数の和:166

約数の個数: 64

約数和(自身を含む): 34836480

約数和(自身を除く): 13870535

約数列:

[1, 5, 7, 11, 13, 35, 55, 59, 65, 71, 77, 91, 143, 295, 355, 385, 413, 455, 497, 649, 715, 767, 781, 923, 1001, 2065, 2485, 3245, 3835, 3905, 4189, 4543, 4615, 5005, 5369, 5467, 6461, 8437, 10153, 20945, 22715, 26845, 27335, 29323, 32305, 42185, 46079, 50765, 54457, 59059, 71071, 146615, 230395, 272285, 295295, 322553, 355355, 381199, 599027, 1612765, 1905995, 2995135, 4193189, 20965945]

約数ペア:

[(1, 20965945), (5, 4193189), (7, 2995135), (11, 1905995), (13, 1612765), (35, 599027), (55, 381199), (59, 355355), (65, 322553), (71, 295295), (77, 272285), (91, 230395), (143, 146615), (295, 71071), (355, 59059), (385, 54457), (413, 50765), (455, 46079), (497, 42185), (649, 32305), (715, 29323), (767, 27335), (781, 26845), (923, 22715), (1001, 20945), (2065, 10153), (2485, 8437), (3245, 6461), (3835, 5467), (3905, 5369), (4189, 5005), (4543, 4615)]